Fix potential null pointer dereference.

Change-Id: I12249cc2e647296eb45f9e7f9082fe3b477b9011 Reviewed-on: https://swiftshader-review.googlesource.com/3463Reviewed-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <capn@google.com> Tested-by: Nicolas Capens <capn@google.com>

Fix potential null pointer dereference.
cce8463e · Nicolas Capens · 20c6f342 · cce8463e
Commit cce8463e authored Jun 10, 2015 by Nicolas Capens
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VertexRoutine.cpp src/Shader/VertexRoutine.cpp +1 -1

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--- a/src/Shader/VertexRoutine.cpp
+++ b/src/Shader/VertexRoutine.cpp
@@ -52,7 +52,7 @@ namespace sw
 			Registers r(shader);
 			r.data = data;
 			r.constants = *Pointer<Pointer<Byte> >(data + OFFSET(DrawData,constants));
-			if(shader->instanceIdDeclared)
+			if(shader && shader->instanceIdDeclared)
 			{
 				r.instanceID = *Pointer<Int>(data + OFFSET(DrawData, instanceID));
 			}